Numerical modeling validation for the microclimate thermal condition of semi-closed courtyard spaces between buildings

verfasst von

Aysan Forouzandeh

Abstract

In this study, the microclimate model ENVI-met version 4 was evaluated with field data inside courtyard spaces. The measurements were planned in different climate conditions in summer and winter at different points inside the courtyard located in Hannover, Germany. Climate variables —including air temperature (Ta), relative humidity (RH), wind speed (WS) and mean radiant temperature (T_mrt) — were investigated. The comparison between observation and prediction was performed while considering the accuracy of the model with the different domain and cell sizes, the different lateral boundary conditions for turbulence (LBC for TKE) and the time step size for flow. Consequently, the 2 × 2 × 1 m³ cell-sized model with cyclic LBC for TKE and t_flow = 0 s lead to quicker simulation and reliable results. This study provides further confidence that the ENVI-met model is capable of predicting the microclimate variables inside medium-narrow courtyards with an acceptable accuracy. The root mean square error (RMSE) value at the center of the shaded courtyard was calculated as approximately 0.73 °C for Ta, 3.34% for RH, 0.01 m/s for WS and 8.44 °C for Tmrt. However, due to the model resolution, inaccuracies in the values are displayed for Tmrt in the sun-exposed areas.

Organisationseinheit(en)

Institut für Bauphysik

Typ

Artikel

Journal

Sustainable Cities and Society

Band

36

Seiten

327-345

Anzahl der Seiten

19

ISSN

2210-6707

Publikationsdatum

01.2018

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Geografie, Planung und Entwicklung, Tief- und Ingenieurbau, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Verkehr

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1016/j.scs.2017.07.025 (Zugang: Geschlossen)